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(No Moda.)-

D. R. WARD.

BLGWER 0R EXHAUSTER.

No. 588,513. Patented Aug. 17,1897.

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UNITED STATES 'PATENT rrr-cn.

DAVID REYNOLDS WARD, OF NEWARK, NEW JERSEY, ASSIGNOR OF ONE- HALF TO CHARLES F. BURROUGHS, OF SAME PLACE.

BLOWER-OR EXHAUSTER;V

SPECIFICATION forming part of Letters Patent No. 588,513, dated August 17', 18971 Application filed-April 9, 1895. Renewed January 8, v1897. Serial No. 618,484. (No model.) y

To all whom, t may concern,.-

Be it known that I, DAVID REYNOLDS WARD, a citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented cerso that the lair passing through the blastwheel of the blower or eXhauster will be distributed more evenly at its periphery into the air space or channel.

In the following description I will refer to my improvements as embodied in an airblower, which construction is also illustrated in the drawings, but I would have it understood that Ido not thereby limit myself to this particular adaptation of the invention, as it may be used in connection with an eX- hauster and in other connections.

With'these and other ends in View the invention contemplates a suitable casing having onestraight side and one inclinedl side, a driving-.shaft journaled in bearingssecured to the casing, and a blast-wheel comprising` a curved disk secured on theV shaft, the side plates, and a number of blades arranged between said side plates in such a manner that a portion'of the air picked up by one blade will be distributed to a succeeding blade or blades..

Myinvention consists also of certain otherV features and details of construction, which will be more fully pointed out hereinafter.

In the accompanying drawings, Figure lis l a side elevation of a blower embodying my invention, showing the casing and one side plate of the blast-wheel partially broken away to disclose the arrangement of the blades. Fig. 2 is a vertical view of the arrangement on the line 2 2 of Fig. 1.

Referring to the drawings, in which like letters of reference denote corresponding parts in both figures, A designates the casing,which is made substantially in the usual shape, and

(opening B.

itvhas a straight side ct and an inclined side et', each side being provided with a central The inclined side ct approaches the straight side a and forms a narrow neck b, beyond which is an enlarged air space or channel b. Secured on the side of the casing are supporting-arms O, which terminate in rings c and support the bearings D for the driving-shaft d.

Between the two journal-bearings D, I arrange a disk on the shaft, and this disk has a curved or flared surface E, the outer periphery e of which is adjacent to the edge of the central opening in the straight side ct of the casing, while the inner edge e of said curved surface isarranged substantially flush with the adjacent jou rnal-bearing, as clearly shown in Fig. 2, so that the air entering the blower will pass over a continuous smooth surface into the passages formed by the blades of the blast-wheel. A straight side plate F is secured in a suitable manner to the outer periphery e of the disk and it extends up to the neck 'ofthe casing parallel with the straight side thereof. An inclined side plate f is arranged adjacent to the inclined side ct/ of the casing, and it extends from the neck of the casing to the opening B and is securedto the straight side plate F by means of the blades hereinafter described. l

Blades have been arranged in blowers in many different ways to enable the air to be received into and discharged from the blastwheel with as little friction as possible and to the best possible advantage, but, as far as I am aware, in all of them the Aair does not iiow freely from the blast-wheel at all points of its periphery.

I have endeavored to provide such an arrangement and construction of the blades that a portion of the air entering the blastwheel in front of a given blade will pass in rear thereof to a succeeding blade or blades. By this means I lessen the com pacting of the air against any particular blade, thus causing the air to be distributed more evenly at the periphery. With these ends in view I may arrange the blades in the manner indicated in Fig. l, in which I have shown the main blades divided in effect into three parts m, m', and m", the shorter blades divided- IOO into two parts n and 0V, and the short undivided blades o, the adjacent parts of each divided blade heilig out of alinement with each other, so that a space or passage is left between the parts of the blades through which a portion of the air may pass to asucceeding blade or blades. The blades are divided transversely, and the adjacent ends of the parts formed by said division are olset, leaving said ends approximately equidistant from the axis of the blast-wheel.

The divided blades and the shorter blades shown in Fig. 1 comprise, substantially, three series-an inner series G, a middle series II, and an outer series I. I may use but two series or more than two, if desired, but I find that three series arranged substantially as shown produce a superior result. In dividing and arranging the blades I employ a construction comprisinga divided main blade extending from the inner edge to the periphery of the blast-wheel and one or more shorter blades, divided or not, in the rear of the main blade; but this particular construction and arrangement is not essential, nor do I in any way restrict or limit myself thereto.

rl`he blades are secured between the side plates by rivets, preferably as shown in dotted lilies in Fig. 1, and I may provide flanges on the ends of the blades to receive holes for the rivets.

The parts in series G and I are curved in opposite directions, and the parts in the middle series H are preferably straight and arranged out of radial alinement with the parts of the inner and outer series, so that passages are formed between lthe ends of the parts of the middle series and the inner ends of the in ner and outer series thro ugh which portions of the air may pass from in front of one part of a divided yblade to the rear of the next part of said divided blade, indicated by the arrows in the drawings. This offset arrangement of divided blades provides fora continuous current from the front to the rear of the parts of the blades, as aforesaid, without changing in any considerable degree its line of direction.

I am aware that changes in the form and proportion of parts and details of construction of my invention may be made without departing from the spirit or sacrificing the advantages thereof, and I therefore reserve the right to make all such changes as fairly fall within the scope ofthe invention.

The amount of the oiset of the parts of the blades shown in Fig. 1 depends upon the character of the blower in which they are used, and will be determined in each instance by the circumstances of the case.

For convenience of dcscri ption I have treated the blades as divided into parts, but it is obvious that each part may be regarded as a separate blade. It is not essential that the blades designated by me as parts be of such length that if placed in radial alinement they would form a continuous blade.

As hereinbefore mentioned, the invention 'is designed, primarily, to be used as a blower,

but only slight changes are necessary to adapt it tor use as an exhauster, and it is capable of other uses, which it is unnecessary to refer to.

I do not claim the construction described in the British patent to Evans, No. 3,016, dated February 26, 1887, which shows a fan or blast-wheel provided with vanes, each of which may be constructed in two separate pieces, leaving a port or opening about midway of the vane, or in one piece having the port or opening cut out of the vane. My invention is not present in said patent, the Evans construction, as therein described, being such that the results which I eect cannot be accomplished thereby.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a blast-wheel, a blade divided transversely into two or more parts said parts being secured rigidly in a ixed relation to each other and the adjacent ends thereof formed by said division being offset, substantially as described.

2. A blast-wheel having a number of blades arranged therein rigidly in a fixed relation to each other said blades being divided transverselyinto two or more parts and said parts being oiset so that a line across the opening bounded by the ends formed by a division of said blades is approximately at right angles to the radial direction of said parts at their point of offset.

3. In a blast-wheel, a blade divided transversely into two or more parts, said parts being ot'set and secured rigidly in a fixed relation to each other so that the ends formed by said division are approximately equidistant from the axis of said blast-wheel.

4. In a blast-wheel, the combination of an outer series of curved parts Lan inner series of reversely-curved parts G and a middle series of straight parts H, the inner ends of the parts in the inner and outer series heilig offset with relation to the ends of the parts in the middle series, substantially as described.

Signed at New York, in the county of New York and State of New York, this 8th day'of April, A. D. 18H5.

DAVID REYNOLDS IVARD.

Witnesses: y

HERMAN GUsToW, WM. O. BELT.

IOO

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